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Simplifying -9x + 12 = -3(3x + -4) Reorder the terms: 12 + -9x = -3(3x + -4) Reorder the terms: 12 + -9x = -3(-4 + 3x) 12 + -9x = (-4 * -3 + 3x * -3) 12 + -9x = (12 + -9x) Add '-12' to each side of the equation. 12 + -12 + -9x = 12 + -12 + -9x Combine like terms: 12 + -12 = 0 0 + -9x = 12 + -12 + -9x -9x = 12 + -12 + -9x Combine like terms: 12 + -12 = 0 -9x = 0 + -9x -9x = -9x Add '9x' to each side of the equation. -9x + 9x = -9x + 9x Combine like terms: -9x + 9x = 0 0 = -9x + 9x Combine like terms: -9x + 9x = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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